1) The person you're addressing has only one question on SCN posted over 10 years ago. He/she might not be on SCN or even in SAP anymore. If you are expecting to receive an answer, addressing just one person would be very ineffective as others (who might know the answer) might not take such question seriously and would just ignore it.

2) The question is not clear. Is it "specific area" or "specific line"? Word is not Excel, there is really no "line" concept. E.g. a brand new document has 0 lines, so how would you "write into a specific line"? You'd probably have to hit Enter key a few times first to create new lines. Then you could type in something in them. It's not clear whether you're asking about a new documents or changing an existing document.

3) It's not clear what "answers" have you followed. If you've already found some similar questions on SCN then post the links and specific explanation what did not work.

Please see this blog for more suggestions on how to ask better questions.